In-situ characterization of interactive fiber-rubber composites using innovative test methodsThursday (24.09.2020) 14:45 - 15:00 Z: Special Symposia II Part of:
To validate and characterize the behavior and damage mechanisms of the new material „interactive fiber-rubber-composites (I-FRC)” it is important to develop test scenarios that fit the future application well. Because of their unique composition (fiber reinforcement, active materials, and soft, elastomeric matrix), the local differences in material behavior are high. In this case, the use of in situ test strategies is preferred. Different methods have been tested, and especially imaging procedures were suited.
The digital image correlation (DIC) was applied for I-FRC and will be tested further for the active components, e. g. dielectric elastomer actuators (DEAs). The deformation behavior of the DEAs can be monitored over a certain time and fatigue phenomena can be recorded. In this way, it could be possible to predict the failure of the component and ensure the structural health of I-FRC in the future. Because of the limited field of view of a two-camera setup, a multi-camera ring was built which allowed recording with 12 different cameras at a time. With the MultiDIC toolbox, it was possible to record moving I-FRC samples from different angles to validate strain concentration on the samples' surface. In a different test-scenario, a commercial DIC-system was used and speckle-patches adhered to an I-FRC demonstrator’s surface, and position information was gathered using the related software. In this example, the resonance frequency of a fish fin was received but other test-setups were built as well.
Additionally, the flash impulse thermography was tested on different sample geometries and setups. The resulting thermographic pictures showed differences in feedback when defects were present. The used techniques are just an example of a variety of different methods to characterize and validate deformation behavior, damage occurrences, and position information.